As we all know, the general theory of relativity states that a black hole is a region of space from which nothing can escape – including light. Astronomers have identified lots of places where black holes may exist, but apparently they missed one – about 60km north of Tokyo. Despite being essentially invisible, a black hole can be observed through its interaction with other matter, which in this case is not the movement of galaxies, but rather some school buildings in Gyōda city, in the Saitama prefecture. The result of the deformation of spacetime caused by a very compact…